665660450810 has 16 divisors (see below), whose sum is σ = 1202422699296. Its totient is φ = 265323316368.

The previous prime is 665660450801. The next prime is 665660450881. The reversal of 665660450810 is 18054066566.

It is a super-2 number, since 2×665660450810² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117605024 + ... + 117610683.

It is an arithmetic number, because the mean of its divisors is an integer number (75151418706).

Almost surely, 2^665660450810 is an apocalyptic number.

665660450810 is a deficient number, since it is larger than the sum of its proper divisors (536762248486).

665660450810 is a wasteful number, since it uses less digits than its factorization.

665660450810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235215997.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 665660450810 in words is "six hundred sixty-five billion, six hundred sixty million, four hundred fifty thousand, eight hundred ten".